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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc51088843ea08fa3c8d4424506772d9bd53e6c637b28a58b19c06f5722c9155' 
  AND token = 'P87AS6Y3CsX2xG/KYKxNIrM5ZKg8jsWI6g75aEJB2mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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