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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc9037d74f97c1936c9014139f5472b263a0d4dbe07e4b39e29d0e7c873670e' 
  AND token = 'Sgeo2ga2HhjtNIVD12Cvov61C23NZcIKuG09L7vqGw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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