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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1631d4fc86a88cb1f9974fa056b9156447a8453bea694add137215a12f3d18' 
  AND token = 'X33i6hP3OcQXsIf4Fp732qdsCN5N73uOIJUKI8mXKnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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