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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805d2744ce56818111696aac8a1e277b33c2ba3a5233a8b393e1daff76795be1' 
  AND token = '67sAT0flJpAefKs+qGC7i9MhFG4uElPNDAhPc6ceRt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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