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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0cb066c96e7eed46c1c3ced47336f3d97f2e26feeace3bac8d18b78ff3544a' 
  AND token = 'BmcflySJEPHeyOHXMaBIiNt1u5Fmgoncr796nGBj6IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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