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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9213dfe863761353d28afe12883b0861e7d7eba830adca1baa7eff8050d3a4b' 
  AND token = 'jAg55qoVE/Lttzr3PuLpjTLIRw64otFZ6lcvwHGlcB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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