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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a63e9a8915f856ef361c6e8643c04029a7f58319d73f00d66c8a506dd114ed' 
  AND token = 'kQwUn8+XKbTcizO9J5QREZFKC/xN4Zijka9BvrPHfQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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