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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8038f1d6c00de3be2a2dda170e88215f82f41028ecf360e481985b011c3fcf5d' 
  AND token = 'FdWLtA4hYW4vvlj8L7rLdpBH0q7fNbTtrfBE383YCCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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