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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9513df6ea9495a7d848584f0d08203a536c7fffe51c83d1dcb673e0ec33eaaed' 
  AND token = 'hmG3U2AcjHDdpdJadrwnLhzQwzg2FfQqMv7E2gqNgGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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