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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9dcbaaae5fbdf511a77258fe6b2e43c73c9b52057b5f6701ca046aea10d4ab' 
  AND token = 'dZ0kiOD7A12+bO+c2hfk45LCyg8CO8LINRhKiO48Wz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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