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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb3131bd187536901453c3bf158d26e2a6e74f7e312497ad85552ee7e29ac55' 
  AND token = '+oZsRPK3as8Priidh3razptosDg/VZmEXi3n8Jmyd28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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