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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc11c3b52b15ee5a0e3644d574750ad6b32a77385e8d75db804df11607c01ae' 
  AND token = 'fxW90x0hSaK+Fst9SNfWfF82gxmiw+mU8Ql9TBWmslk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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