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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8313925e0e12fee992a0ac95c3746d60ddb6965f78f50ecff94763c59bc0bb7' 
  AND token = '8nnQD6auYWoU6cDS7pJ7/6fG9InYr023Bsb26E2i7/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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