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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09c3b43bea7110bb66041889dad078b832966e16645dbcafdad97a3af0064b8' 
  AND token = 'wL74ZK8scvrB2u/iaxuSPbqs7HJGiGYYLS6rdH54D/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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