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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5d447dd5e57df1e2c5e9bb4cf2bf87a99d989c4312bab024c07db97d3ccd25' 
  AND token = '+uSurcy2l6V6w+Mcpm9APiwntMdMg7N24VmCUCBJi6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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