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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a5ef227fe1000b36c9ed4528b34f65057c2f2727164bfbf4b82da4eec3a8d5' 
  AND token = '4x6LS019kWQ/AYBm0qzYH0pr0Ri4C04xkMKYOTeT38g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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