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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816c1a1db464f584319405389eea3650590c9c8cf377eeebc293e41cd1fbb2a7' 
  AND token = 'dPor0O25/4YKWS0RgogKev0X6r1G+qzUzXF1MmIMuRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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