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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce76cc4625afffe47fe07f85b7be71ec19e26334e23f94f19b890aefedaf7fb' 
  AND token = 'v0MIlnE33FihNROgpLKH2gBerY9cfnE6696UWGz5R3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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