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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58552563296fe7fb565cefcbd9e5ce1ead5ff0ec376d25e2804d3ef67735827e' 
  AND token = '5xbAih8w/8F91gvVUIaDrQvfkoYe6Ea/3cWXsc+t3+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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