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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b82932a83f23d1f984cefb72c749f1bd1889aeff5cd2c850f89ea963c25773' 
  AND token = '3fvZRocvlG7Vi4sh+VKXeS/HNIdPNK1pczNaTiwL5xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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