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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb1ee7446477f748a50c9e46222829552478ef3402a07dbbc660f8f3a2555b8' 
  AND token = 's6IPhHk0S0wdFFnHI4csjwzzvf/+NiUERUYW8IbbrpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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