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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add327df2df3a017989327979403a0d168a0e50d06d2839bd50e25355501508b' 
  AND token = 'L4RzcTQNGSqhfQSUPLxTKSwPk3JrWE9MfeYGhxP0phE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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