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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b144a612894eeb19027f791704d9e1d7c3fcfba098cc6a3ee454e531e8bfa8f9' 
  AND token = 'L0iE9N5TflfdP4eW3n4wE+FiSf2Bv7h0YP+8l2Z4g+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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