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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f2851c736841f9c2036201b8a84ef3a0b347e8b8b62276ac04c64a6baeebf4' 
  AND token = 'SG0qCnRsHbpFLzVGWu1hSH2QFnqigKHrbfomT3xG1qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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