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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d56c2a1ece5c3d68e6976222eba458c24ed6b2e0098d7c3004f99e44a50884' 
  AND token = 'cq2wmnFhNVGuQMjr3aJUQfFz5s02gzij1/qDIgiu/B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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