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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1430a9d3d98b6156076d88c12e20bcf8caefc8cdeba41cb9359364da11a72166' 
  AND token = 'a8zN7xc01TuEXIcsp0Ih8U/nF0uypTLflUNn9Zx/Tek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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