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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8659bfb04f8bc2fd74df3e2d63e893e7cdef2732e0f4e536f2245b60e4012d30' 
  AND token = 'hZYAwhymKXD3uOQks3/JzCZPERPt/Ybb/2U2npotHS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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