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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf393d3204b71ef521061bec562cd6203a275bb840b3f166982fe00c42f85acc' 
  AND token = 'n1/b1wGLq7is0xSk4Tfd5fh2SIHDHoJnQ3LsonEPDcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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