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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f691ec75293332dd1ffd807f456f42bcd6710d8f39590b1d4af1d1665ff18470' 
  AND token = 'jjBMkG0J31qbMRwXbO+TNzW1irkUw1APqHCs25ZE5p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}