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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2bfb2c5545c5bc5947ee30ebd8b365c876ee891e7e6a1d6b33dfed06b0d512' 
  AND token = 'zl0svyItEMV6vRweLLhpLATUpvY/9HsbFfoFSpCaxC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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