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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7963ace67a42dc341d67dc3d2b204f41d1edc0e6bcc299406f175ea342371d7' 
  AND token = 'U+38HL/yvtj8DW3FJ2roABtr5hI/PYjUQH4ffjEUmxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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