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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe2798a061c2794d25b6c5480c583ef0847758869ccbebdcfbe69f56f979d0e' 
  AND token = 'x2RedxIAq80xZ9f7nwvZhDhIX/t8nd4AbT2I+8oPP+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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