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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512966675b1d5d5c3a2367c133bfb5673ceff95d0b94e19a0e4655fc49df69e8' 
  AND token = 'qcqik0eR0Aw2GwEPpo4Dxkkltw2bMTH+dQi/WRYFAwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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