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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ecc8423a04ef5fafbc2a16777227d7286e24648cc76ed17232bd46dc0669d0' 
  AND token = 'qdg+qq3YZ7IIre+OWwxQ0F93qtK8ViA/0syHpElE3pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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