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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d9de9a4e84f9dfbce9b98bf870c178e80eb6e7f641bd65ab96fb784a95de35' 
  AND token = 'bJjPbhxLCSBwhRYVZbHROIcY3z2aKOrTJK2RwFx34hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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