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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb85d566822a1eea04ab8ff6209c2efd0c4a2167e0fd1a91feea4c73640359d7' 
  AND token = '7Y2g9D2V0DyPV32eTIz1ANzeaisk53i9A26F+EF3kLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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