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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd615e5162cca0e0eef3e6ec73ebc9ad7bf5f2d32010d15e7f683b7942b8580c4' 
  AND token = 'Sp98r7gfZSAycY90q4b5+Y+9vrCXsYZ6Xa4QcdgQ+KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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