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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022908601007d3fdbd805435f8667216f8c4cd71042c235943c330f9b0f50c8e' 
  AND token = 'odtHxrDu/fhXW4zNR+LA3AJ5aWLiFjdHDQ2bqN7UgX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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