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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abd5c72be359f3126b0fbe1b3546077ed2e06d13641594bb2a8f9a61af36d1c' 
  AND token = 'InsyPhWgax9RFB5xaYzM8cPpab5qepx9SMh7J1Cckrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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