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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8af64dca90708217a1c45dbb0c5ca6601eb3482a9701fc83dc2fbe538000ec3' 
  AND token = '7Bqvs+XjQ2UoGK8cWYuNnMYQStkQgQz7GVng4tKgg0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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