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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608488be29516a2a980979570b07f85b094a5122b6926658eade5da6b1a0864c' 
  AND token = 'y0NPLNNI5Ep5k1GK3WHzlQ5cZuvvb8FhaLE/Ux+ggvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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