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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee14653e26edd2cbf97372eb2d1f80d5cc8a6cf8a4f70a1a9e9d163566d31de9' 
  AND token = 'x7V+cjzxhVwvLSAJTby0hIpwBIh+TQ8bOEUkSC6+nTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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