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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794d6fa52aaea8bb49b0f54e6bfd555165e1283f9367230f16c048a31f8da8f1' 
  AND token = 'fhyM4DZYBnJWk2146BWAUAhazWcBTpWxRGLY82LBAMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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