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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0752ed72b25d6f261edfc9e667aa2e70cc84ebc24de1f6e8256eaa3ad84b22a5' 
  AND token = '5Y+W1JJ2nEUQh3VDi3BPI/3hsn2ya3WYVFOyVfkc+Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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