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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb38d3b073304aef1b9a388dfc924e54156cb3268b4c9093cd6c14769168e57' 
  AND token = 'plrV9VbVFOe7i7zC77rLUQwoNb8z3SopY1btb+Mzs6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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