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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daaab829b532f2a966f5e9dfb16656d5931c92fc3296e28a9e418440135ae9f5' 
  AND token = 'V44q/dro7Ynh3P6n8D96Jinv+fd8Nzx0LbHBPvcwbAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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