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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8449230b0eb76ac6f849a1cf7a59a4092a941006df389bff7e909ef2fc2102' 
  AND token = 'vR7yP/WDz80D01hfzIf3QF+dGADXDQLAdlCWGujw6e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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