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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7abe6842a1cc07b3f23ca871604c67fca58d80bdf926dc29e5e9f3301e8feb9' 
  AND token = 'npbihss2IYEA11H/VAS5UYBaVrgmE9i8id1u6cSRx2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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