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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7702405dc8f31ad83da7baa84332afd58529951596bb151edbc345bb2b7794' 
  AND token = 'r6SxQ/pM2D3JMYzxSa9Da+in7HQeGA5NUU/3hz4iQ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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