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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6502b1c59277acda8890c154766198e89d12dd8c38d433897e2d048f19663d' 
  AND token = 'EQ0vz1Z6rjXtQSCVkiM8nZma+oy7n1E8O/InDZb8pSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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