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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87029ba111b1dee62cdf9e9d7977b0a664bd579d526fcf98ac9a69025314c817' 
  AND token = 'suN6oa8j3NmC3OSbRCuRC0Vs7xZ01jHjJavyFdCA4EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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