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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b87fb710f1c29b2990139bd6d888a4eb8481265462464fb5b6ea4c7839deca' 
  AND token = 'Zd5biaiZQbwrNNGBABqmxv2m3Jf7bmLawp3FW8Xioh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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